For gaming I don't think you'll need a 64 bit chip for at least a year or so. From what I have heard (and I could be wrong) Windows isn't even going to support 64 bit until late 2004.
Dunno how that relates to individual apps though...
Graphics cards seem more important to games than procs anyway. If you really want lots of CPU power you could get a dual proc system. Probably cost about as much as a 64 bit setup, and more stuff can (presently) take advantage of it.
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